Welcome lifeiscomplex!
It's really great that you've decided to deal with this now at your age - congratulations! We all know what it's like to try to cut down (or quit) or our own, only to find ourselves doing the same thing over and over. It only gets worse if we don't deal with it.
Peer pressure is tough, but you can do it and be proud that you're not falling all over yourself and doing the stupid things we all do when we're drinking. It's wise to decline the invites to parties and bars for a while, at least until you feel a little stronger in your sobriety.
Keep reading and posting - there's a lot of support and inspiration here!